Add full contract spec to base prompt, GitHub provider prompt, and tool descriptions

Fix top_n type coercion for models returning string integers

Fix planner ignoring tool calls when finish_reason is stop

Upgrade to hierarchical schema and build_request() API

Fix empty tool arguments from Fireworks model appending <|call|>

Add structured execution trace to A2A task responses

Fix: add trailing slash to multi-provider agent card URLs (avoid 307 redirect)

Support multiple providers in one server

Fix agent card URL: use public HF Space URL instead of internal 0.0.0.0

Configure Fireworks AI models and fix Docker build for private repos

Initial implementation: fireaction A2A agent services